CT SB00236

Defines "peak shaving" as using on-site power generation to reduce power consumption from the electric grid, effective July 1, 2022.

Requires diesel reciprocating engines over 5 megawatts of generating capacity installed for emergencies and peak shaving to meet strict emission limits: nitrogen oxide (0.6 lbs/MWh), particulate matter (0.07 lbs/MWh), carbon monoxide (2.0 lbs/MWh), and non-methane hydrocarbons (0.3 lbs/MWh).

Prohibits operation of such engines for peak shaving, testing, or maintenance on days when the Commissioner of Energy and Environmental Protection forecasts ozone levels as "moderate to unhealthy for sensitive groups" or worse.

Limits diesel engine operation to maximum 300 hours per year for peak shaving and 500 cumulative hours per year for all peak shaving, maintenance, and testing combined.

Requires exhaust stacks to discharge at least 34 feet above ground elevation to meet air modeling guidelines, and allows the Commissioner to adopt more stringent requirements as authorized under federal air permitting regulations.